128455040 has 128 divisors (see below), whose sum is σ = 358240320. Its totient is φ = 43130880.

The previous prime is 128455003. The next prime is 128455049. The reversal of 128455040 is 40554821.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 128454994 and 128455012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128455049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237170 + ... + 237710.

Almost surely, 2^128455040 is an apocalyptic number.

128455040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128455040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179120160).

128455040 is an abundant number, since it is smaller than the sum of its proper divisors (229785280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128455040 is an equidigital number, since it uses as much as digits as its factorization.

128455040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 128455040 is about 11333.8007746740. The cubic root of 128455040 is about 504.5649162449.

The spelling of 128455040 in words is "one hundred twenty-eight million, four hundred fifty-five thousand, forty".